Condenser



Eatented Mar. 31, 1931 UNITED STATES GUSTAV MARTEN JUSTIN'U'S BLOMQVIST,

or sTocKHoLM, swnnnn, A'ssrenon. "'ro PLATEN-MUNTERS REFRIGERATING-SYSTEM, AKTIEBQLAG, OF STOCKHOLM;

. SWEDEN, A CORZ PORATION- OF SWEDEN CONDENSER Application filedSeptember. 20, 1930, Serial No. 483,166, and in Germany June 13, 1929.

This invention relates to condensersfor refrigerators and consists oftwo pipes each bent in spiral formation and one of which is slightlysmallerthan the other to enable such spiral coils of pipes to be screwedinto each other into heat exchange relationship,'one of which is adaptedto have a cooling'agent such as water, or the like, passed therethroughand the other of which is adapted to contain the m vapor of aregrigerant such as, for example, onia or the like, which is condensedon account of being cooled by the cooling water.

It is the object of the invention to simplify and cheapen theconstruction heretofore used;

at the same time to provide a device of this character which will fitinto a smaller space and which will perform its function equally well orbetter than previous devices of this character.

In carrying out the invention, both pipes are bent around a suitableform to provide helical coils, the inner coil being of a diameter thatit may be forced with a slight pressure into the outer coil, the twocoils bearing as against each other when in place.

In the drawing:

Fig. 1 is an elevation partly in section illustrating one application ofthe invention; and

Fig. 2 is a similar view of the coils forming the condenser and showingthem only partly telescoped.

Referring to the drawing, the condenser or heat exchanger comprises aninner coil of ipe' 5 10 and an outer coil of pipe 11. One 0 the coilsmay be connected in any desired manner for the circulation therethroughof a cooling medium which may be water and the other coil may beconnected in any desired fluid to be cooled. The coils are formedindependently and are of such relative sizes that one coil may bescrewed into the other coil. The turns of each coil are complementarilyformed, that is, formed so that they will interlock and fit snuglytogether. In making the coils the pipes may be wound aroundmandrelsfmaking the external diameter of the inner coil sli htlygreaterthan the into ternal diameter 0 the outer coil so that when manner forthe circulation therethroughof a the coils are screwed together oraxially telescoped they will beheld in position by a pressure exertedbetween them due to the resiliency of the metal pipes forming the coils.If the condenser is used with refrigerating apparatus the coil for thecooling medium is preferably formed of copper tubing or some othernon-corrosive or corrosion-resisting material and the other coil ispreferably formed of steel or other material that will resist the actionof refrigerant. 1 In general the materials of which the coils are madeshould have good heat conducting properties and be resistant to theaction of the fluid coming in contact therewith.

In this device the heat transfer is princi pally by conduction from thefluid to be cooled to the cooling medium through the metal of the coils.In order to improve the heat transfer-the coils after assembly may bedipped in solder of some good heat conducting metal having a low meltingpoint. The solder 12 fills in the space between the coils and increasesthe heat conducting path between the same.

I claim:

1. A condenser comprising a pair of pipe coils of such diameters thatwhen they are fitted together they resiliently engage.

2. A condenser comprising a pair of pipe coils of diameters such thatone will thread into the other, said inner coil being formed of metalhaving a higher degree of heat conductivity than the outer coil.

3. A condenser comprising a pair of pipe coils of complementarydiameters and threaded one into the other, and a metallic bond betweensaid coils forming a conductor for heat.

4. A condenser comprising a pair of pipe coils of complementarydiameters such that 90 one coil will thread into the-other, said coilsbeing constructed of different materials adapted to resist corrosion bythe fluids contained therein, said coils being maintained in metalliccontact through the medium of a 95 third metal having a lower meltingpoint than the material of which the coils are formed.

5. A device of the class described comprising a pair of pipe coils ofcomplementa diameters threaded together in a manner suc 10o that onecoil substantially houses the other coil within the same, each of thecoils being formed of non-corrodible materials and being metallicallyconnected by means of a soft metal melted about the coils.

6. A condenser comprising a pipe cbil, a second pipe coil of a smallerdiameter than the first coil and disgpsed in telescoped relationrelative to the st coil andsnugly en ga 'ng the same along its length.

n testimony whereof I aflix my signature.

GUSTAV MARTEN JUSTINUS BLOMQVIST.

